ENH: a bit clearer error message.
ENH: a bit clearer error message.

gram526/VTK,msmolens/VTK,Wuteyan/VTK,keithroe/vtkoptix,naucoin/VTKSlicerWidgets,johnkit/vtk-dev,jmerkow/VTK,Wuteyan/VTK,johnkit/vtk-dev,biddisco/VTK,johnkit/vtk-dev,daviddoria/PointGraphsPhase1,naucoin/VTKSlicerWidgets,aashish24/VTK-old,biddisco/VTK,cjh1/VTK,sankhesh/VTK,johnkit/vtk-dev,sumedhasingla/VTK,berendkleinhaneveld/VTK,cjh1/VTK,biddisco/VTK,johnkit/vtk-dev,candy7393/VTK,keithroe/vtkoptix,biddisco/VTK,johnkit/vtk-dev,sankhesh/VTK,jmerkow/VTK,spthaolt/VTK,arnaudgelas/VTK,sgh/vtk,sankhesh/VTK,sankhesh/VTK,arnaudgelas/VTK,jeffbaumes/jeffbaumes-vtk,spthaolt/VTK,sgh/vtk,cjh1/VTK,SimVascular/VTK,msmolens/VTK,jeffbaumes/jeffbaumes-vtk,SimVascular/VTK,candy7393/VTK,Wuteyan/VTK,spthaolt/VTK,daviddoria/PointGraphsPhase1,ashray/VTK-EVM,jmerkow/VTK,biddisco/VTK,arnaudgelas/VTK,Wuteyan/VTK,demarle/VTK,ashray/VTK-EVM,ashray/VTK-EVM,candy7393/VTK,mspark93/VTK,jeffbaumes/jeffbaumes-vtk,collects/VTK,sankhesh/VTK,ashray/VTK-EVM,mspark93/VTK,berendkleinhaneveld/VTK,sgh/vtk,aashish24/VTK-old,msmolens/VTK,arnaudgelas/VTK,mspark93/VTK,naucoin/VTKSlicerWidgets,collects/VTK,sgh/vtk,mspark93/VTK,ashray/VTK-EVM,gram526/VTK,sumedhasingla/VTK,spthaolt/VTK,candy7393/VTK,arnaudgelas/VTK,keithroe/vtkoptix,johnkit/vtk-dev,spthaolt/VTK,gram526/VTK,sumedhasingla/VTK,daviddoria/PointGraphsPhase1,SimVascular/VTK,keithroe/vtkoptix,jeffbaumes/jeffbaumes-vtk,jmerkow/VTK,Wuteyan/VTK,aashish24/VTK-old,naucoin/VTKSlicerWidgets,sumedhasingla/VTK,jeffbaumes/jeffbaumes-vtk,gram526/VTK,aashish24/VTK-old,biddisco/VTK,jmerkow/VTK,spthaolt/VTK,daviddoria/PointGraphsPhase1,cjh1/VTK,gram526/VTK,keithroe/vtkoptix,demarle/VTK,demarle/VTK,daviddoria/PointGraphsPhase1,demarle/VTK,berendkleinhaneveld/VTK,collects/VTK,keithroe/vtkoptix,jmerkow/VTK,aashish24/VTK-old,hendradarwin/VTK,hendradarwin/VTK,sgh/vtk,spthaolt/VTK,daviddoria/PointGraphsPhase1,sankhesh/VTK,berendkleinhaneveld/VTK,mspark93/VTK,berendkleinhaneveld/VTK,arnaudgelas/VTK,mspark93/VTK,sumedhasingla/VTK,biddisco/VTK,collects/VTK,hendradarwin/VTK,ashray/VTK-EVM,msmolens/VTK,sumedhasingla/VTK,SimVascular/VTK,keithroe/vtkoptix,jmerkow/VTK,SimVascular/VTK,naucoin/VTKSlicerWidgets,berendkleinhaneveld/VTK,msmolens/VTK,cjh1/VTK,hendradarwin/VTK,sankhesh/VTK,msmolens/VTK,sumedhasingla/VTK,hendradarwin/VTK,candy7393/VTK,gram526/VTK,candy7393/VTK,collects/VTK,cjh1/VTK,collects/VTK,gram526/VTK,demarle/VTK,demarle/VTK,msmolens/VTK,gram526/VTK,SimVascular/VTK,keithroe/vtkoptix,SimVascular/VTK,Wuteyan/VTK,jeffbaumes/jeffbaumes-vtk,mspark93/VTK,ashray/VTK-EVM,msmolens/VTK,candy7393/VTK,ashray/VTK-EVM,hendradarwin/VTK,demarle/VTK,demarle/VTK,jmerkow/VTK,Wuteyan/VTK,berendkleinhaneveld/VTK,candy7393/VTK,sgh/vtk,aashish24/VTK-old,naucoin/VTKSlicerWidgets,sumedhasingla/VTK,sankhesh/VTK,hendradarwin/VTK,mspark93/VTK,SimVascular/VTK